core: Implement DefineFont4

core/src/display_object/movie_clip.rs

@@ -47,7 +47,7 @@ use std::cmp::max;
 use std::collections::HashMap;
 use std::sync::Arc;
 use swf::extensions::ReadSwfExt;
-use swf::{ClipEventFlag, FontFlag, FrameLabelData, SwfStr, TagCode};
+use swf::{ClipEventFlag, FrameLabelData, TagCode};
 
 use super::interactive::Avm2MousePick;
 
@@ -3962,29 +3962,13 @@ impl<'gc, 'a> MovieClipData<'gc> {
         context: &mut UpdateContext<'_, 'gc>,
         reader: &mut SwfStream<'a>,
     ) -> Result<(), Error> {
-        tracing::warn!("DefineFont4 tag (TLF text) is not implemented");
         let font = reader.read_define_font_4()?;
         let font_id = font.id;
-        let font_object = Font::from_swf_tag(
-            context.gc_context,
-            context.renderer,
-            swf::Font {
-                version: 4,
-                id: font.id,
-                name: SwfStr::from_bytes(b"<Unknown Font4>"),
-                language: swf::Language::Unknown,
-                layout: None,
-                glyphs: Vec::new(),
-                flags: FontFlag::empty(),
-            },
-            reader.encoding(),
-            FontType::EmbeddedCFF,
-        );
+        let font_object = Font::from_font4_tag(context.gc_context, font, reader.encoding())?;
         context
             .library
             .library_for_movie_mut(self.movie())
             .register_character(font_id, Character::Font(font_object));
-
         Ok(())
     }
 

core/src/font.rs

@@ -381,6 +381,7 @@ impl<'gc> Font<'gc> {
         descriptor: FontDescriptor,
         bytes: Cow<'static, [u8]>,
         font_index: u32,
+        font_type: FontType,
     ) -> Result<Font<'gc>, ttf_parser::FaceParsingError> {
         let face = FontFace::new(bytes, font_index)?;
 
@@ -393,7 +394,7 @@ impl<'gc> Font<'gc> {
                 leading: face.leading,
                 glyphs: GlyphSource::FontFace(face),
                 descriptor,
-                font_type: FontType::Device,
+                font_type,
             },
         )))
     }
@@ -472,6 +473,38 @@ impl<'gc> Font<'gc> {
         ))
     }
 
+    pub fn from_font4_tag(
+        gc_context: &Mutation<'gc>,
+        tag: swf::Font4,
+        encoding: &'static swf::Encoding,
+    ) -> Result<Font<'gc>, ttf_parser::FaceParsingError> {
+        let name = tag.name.to_str_lossy(encoding);
+        let descriptor = FontDescriptor::from_parts(&name, tag.is_bold, tag.is_italic);
+
+        if let Some(bytes) = tag.data {
+            Font::from_font_file(
+                gc_context,
+                descriptor,
+                Cow::Owned(bytes.to_vec()),
+                0,
+                FontType::EmbeddedCFF,
+            )
+        } else {
+            Ok(Font(Gc::new(
+                gc_context,
+                FontData {
+                    scale: 1.0,
+                    ascent: 0,
+                    descent: 0,
+                    leading: 0,
+                    glyphs: GlyphSource::Empty,
+                    descriptor,
+                    font_type: FontType::EmbeddedCFF,
+                },
+            )))
+        }
+    }
+
     /// Returns whether this font contains glyph shapes.
     /// If not, this font should be rendered as a device font.
     pub fn has_glyphs(&self) -> bool {

core/src/library.rs

@@ -565,9 +565,13 @@ impl<'gc> Library<'gc> {
                 index,
             } => {
                 let descriptor = FontDescriptor::from_parts(&name, is_bold, is_italic);
-                if let Ok(font) =
-                    Font::from_font_file(gc_context, descriptor, Cow::Owned(data), index)
-                {
+                if let Ok(font) = Font::from_font_file(
+                    gc_context,
+                    descriptor,
+                    Cow::Owned(data),
+                    index,
+                    FontType::Device,
+                ) {
                     let name = font.descriptor().name().to_owned();
                     info!("Loaded new device font \"{name}\" from file");
                     self.device_fonts.register(font);

core/src/tag_utils.rs

@@ -12,6 +12,9 @@ pub enum Error {
     #[error("Couldn't register bitmap: {0}")]
     InvalidBitmap(#[from] ruffle_render::error::Error),
 
+    #[error("Couldn't register font: {0}")]
+    InvalidFont(#[from] ttf_parser::FaceParsingError),
+
     #[error("Attempted to set symbol classes on movie without any")]
     NoSymbolClasses,